Allocators in UZI

 Because of intrinsic nature of DOM documents, they often have numerous child nodes, that can't be allocated by advance.
In order to minimize memory allocation while creating, using, and rendering a DOM tree, every memory based operation goes to a specific interface, the allocator.

This allocator could, like current code, simply use the C++ heap (new and delete) to construct and delete objects on demand.

However, it can also cache and monitor every allocation, and avoid creating tons of small heap allocated object.
It's expected by the first beta release that UZI will batch allocate multiple nodes on starting, and reuse returned nodes instead of unallocating them.

Every part of UZI use its own allocator, so you can tweak almost every memory-specific behaviour.

Please have a look to:
When reusing strongly typed elements like DOM::Element or DOM::Attr, you'll have to first return existing allocated members (for example, DOM::Element own a pointer on an allocated HTML::Elements::Element that must be returned to the allocator, or mutated), then you can use placing new operator [ C++ code is : new(oldNodePointer) DOM::Element(...); ] to recreate a new node, of the same type, on the previous node address space.

It's a good idea to read each class destructor or returnToAllocator method in order to learn what pointer is owned, and what is returned, and so on.

In future UZI versions, profiling will be able to characterize each allocator, and it'll be possible to select the best one before releasing a definitive version.

[1] In HTML::Elements::Allocators, it's required to allocate the different DOM::Node's child by calling respective methods. However returning these nodes to the allocator is done by the single returnNode method. This is because every DOM::Node object must overload the returnToAllocator method to return its specific data.
You must call the returnToAllocator method to return the node to its allocator, and not returnNode method directly.

(C) An X-Ryl669 project 2007

This document describes Unlimited Zooming Interface source code. UZI stands for Unlimited Zooming Interface, and source code license is